llvm::X86FrameLowering Class Reference

#include <X86FrameLowering.h>

Inheritance diagram for llvm::X86FrameLowering:

Collaboration diagram for llvm::X86FrameLowering:

Public Member Functions
	X86FrameLowering (const X86TargetMachine &tm, const X86Subtarget &sti)
void	emitCalleeSavedFrameMoves (MachineFunction &MF, MCSymbol *Label, unsigned FramePtr) const
void	emitPrologue (MachineFunction &MF) const
void	emitEpilogue (MachineFunction &MF, MachineBasicBlock &MBB) const
void	adjustForSegmentedStacks (MachineFunction &MF) const
void	adjustForHiPEPrologue (MachineFunction &MF) const
void	processFunctionBeforeCalleeSavedScan (MachineFunction &MF, RegScavenger *RS=NULL) const
bool	spillCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const
bool	restoreCalleeSavedRegisters (MachineBasicBlock &MBB, MachineBasicBlock::iterator MI, const std::vector< CalleeSavedInfo > &CSI, const TargetRegisterInfo *TRI) const
bool	hasFP (const MachineFunction &MF) const
bool	hasReservedCallFrame (const MachineFunction &MF) const
int	getFrameIndexOffset (const MachineFunction &MF, int FI) const
int	getFrameIndexReference (const MachineFunction &MF, int FI, unsigned &FrameReg) const
void	eliminateCallFramePseudoInstr (MachineFunction &MF, MachineBasicBlock &MBB, MachineBasicBlock::iterator MI) const
Public Member Functions inherited from llvm::TargetFrameLowering
	TargetFrameLowering (StackDirection D, unsigned StackAl, int LAO, unsigned TransAl=1, bool StackReal=true)
virtual	~TargetFrameLowering ()
StackDirection	getStackGrowthDirection () const
unsigned	getStackAlignment () const
unsigned	getTransientStackAlignment () const
bool	isStackRealignable () const
int	getOffsetOfLocalArea () const
virtual bool	isFPCloseToIncomingSP () const
virtual const SpillSlot *	getCalleeSavedSpillSlots (unsigned &NumEntries) const
virtual bool	targetHandlesStackFrameRounding () const
virtual bool	canSimplifyCallFramePseudos (const MachineFunction &MF) const
virtual void	processFunctionBeforeFrameFinalized (MachineFunction &MF, RegScavenger *RS=NULL) const

Additional Inherited Members
Public Types inherited from llvm::TargetFrameLowering
enum	StackDirection { StackGrowsUp, StackGrowsDown }

Detailed Description

Definition at line 26 of file X86FrameLowering.h.

Constructor & Destructor Documentation

llvm::X86FrameLowering::X86FrameLowering ( const X86TargetMachine &  tm, const X86Subtarget &  sti  )

inlineexplicit

Definition at line 30 of file X86FrameLowering.h.

Member Function Documentation

void X86FrameLowering::adjustForHiPEPrologue ( MachineFunction &  MF ) const

virtual

Erlang programs may need a special prologue to handle the stack size they might need at runtime. That is because Erlang/OTP does not implement a C stack but uses a custom implementation of hybrid stack/heap architecture. (for more information see Eric Stenman's Ph.D. thesis: http://publications.uu.se/uu/fulltext/nbn_se_uu_diva-2688.pdf)

CheckStack: temp0 = sp - MaxStack if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart OldStart: ... IncStack: call inc_stack # doubles the stack space temp0 = sp - MaxStack if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1352 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::addLiveIn(), llvm::addRegOffset(), llvm::MachineBasicBlock::addSuccessor(), llvm::Function::arg_size(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::MachineFunction::CreateMachineBasicBlock(), llvm::dyn_cast(), llvm::N86::EBP, llvm::MachineFunction::end(), llvm::N86::ESP, F(), llvm::StringRef::find(), llvm::StringRef::find_first_of(), llvm::MachineFunction::front(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineOperand::getGlobal(), llvm::X86TargetMachine::getInstrInfo(), llvm::Value::getName(), llvm::MachineFunction::getRegInfo(), llvm::X86TargetMachine::getRegisterInfo(), GetScratchRegister(), llvm::X86RegisterInfo::getSlotSize(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFrameInfo::hasCalls(), I, llvm::X86Subtarget::is64Bit(), llvm::MachineOperand::isGlobal(), llvm::MachineRegisterInfo::isLiveIn(), llvm::X86Subtarget::isTargetLinux(), llvm::MachineBasicBlock::livein_begin(), llvm::MachineBasicBlock::livein_end(), llvm::A64CC::MI, llvm::StringRef::npos, llvm::MachineFunction::push_front(), TII, and llvm::MachineFunction::verify().

void X86FrameLowering::adjustForSegmentedStacks ( MachineFunction &  MF ) const

virtual

Adjust the prologue to have the function use segmented stacks. This works by adding a check even before the "normal" function prologue.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1150 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::addLiveIn(), llvm::MachineInstrBuilder::addReg(), llvm::MachineBasicBlock::addSuccessor(), llvm::BuildMI(), llvm::MachineFunction::CreateMachineBasicBlock(), llvm::N86::ESP, llvm::MachineFunction::front(), llvm::X86II::FS, llvm::X86MachineFunctionInfo::getArgumentStackSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::X86TargetMachine::getInstrInfo(), llvm::MachineFunction::getRegInfo(), GetScratchRegister(), llvm::MachineFrameInfo::getStackSize(), llvm::X86II::GS, HasNestArgument(), llvm::X86Subtarget::is64Bit(), llvm::MachineRegisterInfo::isLiveIn(), llvm::X86Subtarget::isTargetDarwin(), llvm::X86Subtarget::isTargetFreeBSD(), llvm::X86Subtarget::isTargetLinux(), llvm::X86Subtarget::isTargetWin32(), llvm::Function::isVarArg(), llvm::RegState::Kill, kSplitStackAvailable, llvm::MachineBasicBlock::livein_begin(), llvm::MachineBasicBlock::livein_end(), llvm::MachineFunction::push_front(), llvm::report_fatal_error(), llvm::MachineRegisterInfo::setPhysRegUsed(), TII, and llvm::MachineFunction::verify().

void X86FrameLowering::eliminateCallFramePseudoInstr ( MachineFunction &  MF, MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI  ) const

virtual

eliminateCallFramePseudoInstr - This method is called during prolog/epilog code insertion to eliminate call frame setup and destroy pseudo instructions (but only if the Target is using them). It is responsible for eliminating these instructions, replacing them with concrete instructions. This method need only be implemented if using call frame setup/destroy pseudo instructions.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1482 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addImm(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::MachineBasicBlock::erase(), getADDriOpcode(), llvm::X86TargetMachine::getFrameLowering(), llvm::X86TargetMachine::getInstrInfo(), llvm::MachineInstr::getOperand(), llvm::X86TargetMachine::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlignment(), llvm::X86RegisterInfo::getStackRegister(), getSUBriOpcode(), hasReservedCallFrame(), I, llvm::MachineBasicBlock::insert(), llvm::X86Subtarget::isTarget64BitLP64(), llvm::prior(), llvm::MachineOperand::setIsDead(), and TII.

void X86FrameLowering::emitCalleeSavedFrameMoves	(	MachineFunction &	MF,
		MCSymbol *	Label,
		unsigned	FramePtr
	)		const

Definition at line 305 of file X86FrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::MCCFIInstruction::createOffset(), llvm::MachineFrameInfo::getCalleeSavedInfo(), llvm::MachineModuleInfo::getContext(), llvm::MCRegisterInfo::getDwarfRegNum(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getMMI(), llvm::MachineFrameInfo::getObjectOffset(), llvm::X86TargetMachine::getRegisterInfo(), llvm::MCContext::getRegisterInfo(), llvm::X86RegisterInfo::getSlotSize(), hasFP(), I, MaxOffset, and MRI.

Referenced by emitPrologue().

void X86FrameLowering::emitEpilogue ( MachineFunction &  MF, MachineBasicBlock &  MBB  ) const

virtual

Implements llvm::TargetFrameLowering.

Definition at line 712 of file X86FrameLowering.cpp.

References llvm::MachineInstrBuilder::addExternalSymbol(), llvm::MachineInstrBuilder::addGlobalAddress(), llvm::MachineInstrBuilder::addOperand(), llvm::addRegOffset(), llvm::MachineBasicBlock::begin(), llvm::BuildMI(), llvm::MachineInstr::copyImplicitOps(), llvm::TargetOpcode::DBG_VALUE, llvm::ISD::EH_RETURN, llvm::emitSPUpdate(), llvm::MachineBasicBlock::end(), llvm::MachineBasicBlock::erase(), ForceStackAlign, llvm::X86MachineFunctionInfo::getCalleeSavedFrameSize(), llvm::MachineFunction::getFrameInfo(), llvm::MachineOperand::getGlobal(), llvm::MachineOperand::getImm(), llvm::MachineFunction::getInfo(), llvm::X86TargetMachine::getInstrInfo(), llvm::MachineBasicBlock::getLastNonDebugInstr(), getLEArOpcode(), llvm::MachineFrameInfo::getMaxAlignment(), llvm::MachineOperand::getOffset(), llvm::MachineOperand::getReg(), llvm::X86TargetMachine::getRegisterInfo(), llvm::TargetFrameLowering::getStackAlignment(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineOperand::getSymbolName(), llvm::MachineOperand::getTargetFlags(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::MachineFrameInfo::hasCalls(), hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::X86Subtarget::is64Bit(), llvm::MachineOperand::isGlobal(), llvm::MachineOperand::isImm(), llvm::isMem(), llvm::MachineOperand::isReg(), llvm::MachineOperand::isSymbol(), llvm::X86Subtarget::isTarget64BitLP64(), llvm::RegState::Kill, llvm_unreachable, mergeSPUpdates(), mergeSPUpdatesUp(), llvm::prior(), TII, and llvm::X86Subtarget::useLeaForSP().

void X86FrameLowering::emitPrologue ( MachineFunction &  MF ) const

virtual

emitProlog/emitEpilog - These methods insert prolog and epilog code into the function.

emitPrologue - Push callee-saved registers onto the stack, which automatically adjust the stack pointer. Adjust the stack pointer to allocate space for local variables. Also emit labels used by the exception handler to generate the exception handling frames.

Implements llvm::TargetFrameLowering.

Definition at line 388 of file X86FrameLowering.cpp.

References llvm::MachineModuleInfo::addFrameInst(), llvm::MachineInstrBuilder::addImm(), llvm::MachineInstrBuilder::addReg(), llvm::addRegOffset(), llvm::MachineFrameInfo::adjustsStack(), llvm::MachineBasicBlock::begin(), llvm::MachineFunction::begin(), llvm::BuildMI(), llvm::MCCFIInstruction::createDefCfaOffset(), llvm::MCCFIInstruction::createDefCfaRegister(), llvm::MCCFIInstruction::createOffset(), llvm::MCContext::CreateTempSymbol(), llvm::RegState::Define, llvm::N86::EAX, emitCalleeSavedFrameMoves(), llvm::emitSPUpdate(), llvm::TargetOptions::EnableSegmentedStacks, llvm::MachineBasicBlock::end(), llvm::MachineFunction::end(), ForceStackAlign, llvm::MachineInstr::FrameSetup, llvm::MachineFunction::front(), llvm::Function::getAttributes(), llvm::X86RegisterInfo::getBaseRegister(), llvm::X86MachineFunctionInfo::getCalleeSavedFrameSize(), llvm::MachineModuleInfo::getContext(), llvm::MachineFunction::getFrameInfo(), llvm::X86RegisterInfo::getFrameRegister(), llvm::MachineFunction::getFunction(), llvm::MachineFunction::getInfo(), llvm::X86TargetMachine::getInstrInfo(), llvm::MachineFrameInfo::getMaxAlignment(), llvm::MachineFunction::getMMI(), llvm::MachineInstr::getOperand(), llvm::X86TargetMachine::getRegisterInfo(), llvm::X86RegisterInfo::getSlotSize(), llvm::TargetFrameLowering::getStackAlignment(), llvm::X86RegisterInfo::getStackRegister(), llvm::MachineFrameInfo::getStackSize(), getSUBriOpcode(), llvm::MachineFunction::getTarget(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::AttributeSet::hasAttribute(), llvm::X86RegisterInfo::hasBasePointer(), llvm::MachineFrameInfo::hasCalls(), llvm::MachineModuleInfo::hasDebugInfo(), hasFP(), llvm::MachineFrameInfo::hasVarSizedObjects(), I, llvm::RegState::Implicit, llvm::MachineBasicBlock::insert(), llvm::X86Subtarget::is64Bit(), isEAXLiveIn(), llvm::X86Subtarget::isOSWindows(), llvm::X86Subtarget::isTarget64BitLP64(), llvm::X86Subtarget::isTargetCygMing(), llvm::X86Subtarget::isTargetEnvMacho(), llvm::X86Subtarget::isTargetWin64(), llvm::RegState::Kill, mergeSPUpdates(), mergeSPUpdatesDown(), llvm::A64CC::MI, llvm::X86RegisterInfo::needsStackRealignment(), llvm::Function::needsUnwindTableEntry(), llvm::next(), llvm::Attribute::NoRedZone, llvm::TargetMachine::Options, llvm::TargetOpcode::PROLOG_LABEL, llvm::X86MachineFunctionInfo::setCalleeSavedFrameSize(), llvm::MachineInstr::setFlag(), llvm::MachineOperand::setIsDead(), llvm::MachineInstrBuilder::setMIFlag(), llvm::MachineFrameInfo::setOffsetAdjustment(), llvm::MachineFrameInfo::setStackSize(), TII, llvm::X86Subtarget::useLeaForSP(), and usesTheStack().

int X86FrameLowering::getFrameIndexOffset ( const MachineFunction &  MF, int  FI  ) const

virtual

getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index.

getFrameIndexOffset - Returns the displacement from the frame register to the stack frame of the specified index. This is the default implementation which is overridden for some targets.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 904 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectAlignment(), llvm::MachineFrameInfo::getObjectOffset(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::TargetMachine::getRegisterInfo(), llvm::X86RegisterInfo::getSlotSize(), llvm::MachineFrameInfo::getStackSize(), llvm::MachineFunction::getTarget(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::X86RegisterInfo::hasBasePointer(), hasFP(), and llvm::X86RegisterInfo::needsStackRealignment().

Referenced by getFrameIndexReference().

int X86FrameLowering::getFrameIndexReference ( const MachineFunction &  MF, int  FI, unsigned &  FrameReg  ) const

virtual

getFrameIndexReference - This method should return the base register and offset used to reference a frame index location. The offset is returned directly, and the base register is returned via FrameReg.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 946 of file X86FrameLowering.cpp.

References llvm::X86RegisterInfo::getBaseRegister(), getFrameIndexOffset(), llvm::X86RegisterInfo::getFrameRegister(), llvm::TargetMachine::getRegisterInfo(), llvm::X86RegisterInfo::getStackRegister(), llvm::MachineFunction::getTarget(), llvm::X86RegisterInfo::hasBasePointer(), and llvm::X86RegisterInfo::needsStackRealignment().

bool X86FrameLowering::hasFP ( const MachineFunction &  MF ) const

virtual

hasFP - Return true if the specified function should have a dedicated frame pointer register. This is true if the function has variable sized allocas or if frame pointer elimination is disabled.

Implements llvm::TargetFrameLowering.

Definition at line 45 of file X86FrameLowering.cpp.

References llvm::MachineModuleInfo::callsEHReturn(), llvm::MachineModuleInfo::callsUnwindInit(), llvm::TargetOptions::DisableFramePointerElim(), llvm::MachineFunction::getFrameInfo(), llvm::MachineFunction::getInfo(), llvm::MachineFunction::getMMI(), llvm::X86TargetMachine::getRegisterInfo(), llvm::MachineFunction::getTarget(), llvm::MachineFunction::hasMSInlineAsm(), llvm::MachineFrameInfo::hasVarSizedObjects(), llvm::MachineFrameInfo::isFrameAddressTaken(), llvm::TargetRegisterInfo::needsStackRealignment(), and llvm::TargetMachine::Options.

Referenced by emitCalleeSavedFrameMoves(), emitEpilogue(), emitPrologue(), getFrameIndexOffset(), and processFunctionBeforeCalleeSavedScan().

bool X86FrameLowering::hasReservedCallFrame ( const MachineFunction &  MF ) const

virtual

hasReservedCallFrame - Under normal circumstances, when a frame pointer is not required, we reserve argument space for call sites in the function immediately on entry to the current function. This eliminates the need for add/sub sp brackets around call sites. Returns true if the call frame is included as part of the stack frame.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 38 of file X86FrameLowering.cpp.

References llvm::MachineFunction::getFrameInfo(), and llvm::MachineFrameInfo::hasVarSizedObjects().

Referenced by eliminateCallFramePseudoInstr().

void X86FrameLowering::processFunctionBeforeCalleeSavedScan ( MachineFunction &  MF, RegScavenger *  RS = NULL  ) const

virtual

processFunctionBeforeCalleeSavedScan - This method is called immediately before PrologEpilogInserter scans the physical registers used to determine what callee saved registers should be spilled. This method is optional.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1057 of file X86FrameLowering.cpp.

References llvm::MachineFrameInfo::CreateFixedObject(), llvm::X86RegisterInfo::getBaseRegister(), llvm::MachineFunction::getFrameInfo(), llvm::TargetMachine::getFrameLowering(), llvm::MachineFunction::getInfo(), llvm::MachineFrameInfo::getObjectIndexBegin(), llvm::TargetFrameLowering::getOffsetOfLocalArea(), llvm::MachineFunction::getRegInfo(), llvm::X86TargetMachine::getRegisterInfo(), llvm::X86RegisterInfo::getSlotSize(), llvm::MachineFunction::getTarget(), llvm::X86MachineFunctionInfo::getTCReturnAddrDelta(), llvm::X86RegisterInfo::hasBasePointer(), hasFP(), and llvm::MachineRegisterInfo::setPhysRegUsed().

bool X86FrameLowering::restoreCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, const std::vector< CalleeSavedInfo > &  CSI, const TargetRegisterInfo *  TRI  ) const

virtual

restoreCalleeSavedRegisters - Issues instruction(s) to restore all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of load instructions via loadRegToStackSlot(). Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 1017 of file X86FrameLowering.cpp.

References llvm::BuildMI(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MCInstrInfo::get(), llvm::TargetRegisterInfo::getFrameRegister(), llvm::TargetMachine::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getTarget(), llvm::X86Subtarget::is64Bit(), llvm::TargetInstrInfo::loadRegFromStackSlot(), and TII.

bool X86FrameLowering::spillCalleeSavedRegisters ( MachineBasicBlock &  MBB, MachineBasicBlock::iterator  MI, const std::vector< CalleeSavedInfo > &  CSI, const TargetRegisterInfo *  TRI  ) const

virtual

spillCalleeSavedRegisters - Issues instruction(s) to spill all callee saved registers and returns true if it isn't possible / profitable to do so by issuing a series of store instructions via storeRegToStackSlot(). Returns false otherwise.

Reimplemented from llvm::TargetFrameLowering.

Definition at line 962 of file X86FrameLowering.cpp.

References llvm::MachineBasicBlock::addLiveIn(), llvm::BuildMI(), llvm::MachineBasicBlock::findDebugLoc(), llvm::MachineInstr::FrameSetup, llvm::MCInstrInfo::get(), llvm::TargetRegisterInfo::getFrameRegister(), llvm::MachineFunction::getInfo(), llvm::TargetMachine::getInstrInfo(), llvm::TargetRegisterInfo::getMinimalPhysRegClass(), llvm::MachineBasicBlock::getParent(), llvm::MachineFunction::getTarget(), llvm::X86Subtarget::is64Bit(), llvm::RegState::Kill, llvm::X86MachineFunctionInfo::setCalleeSavedFrameSize(), llvm::MachineInstrBuilder::setMIFlag(), llvm::TargetInstrInfo::storeRegToStackSlot(), and TII.

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The documentation for this class was generated from the following files:

• X86FrameLowering.h
• X86FrameLowering.cpp